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SECURITIES - Securities Held-to-maturity Major Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 383,922 | $ 179,309
Gross Unrecognized Gains |  | 59
Gross Unrecognized Losses | (25,233) | (2,014)
Fair Value | 358,689 | 177,354
Agency Notes |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 88,858 |
Gross Unrecognized Losses | (5,025) |
Fair Value | 83,833 |
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 180,379 | 118,382
Gross Unrecognized Gains |  | 59
Gross Unrecognized Losses | (13,503) | (1,141)
Fair Value | 166,876 | 117,300
Agency collateralized mortgage obligations ("CMOs") |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 114,685 | 60,927
Gross Unrecognized Losses | (6,705) | (873)
Fair Value | $ 107,980 | $ 60,054

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